| Name | Petroleum County |
| State | Montana |
| FIPS Code | 30069 |
| County Seat | Winnett |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 543 |
| Population Growth Rate(2020-2024) | 8.47% |
| Majority Ethnicity | White 99.25% |
| Public School Majority Ethnicity | White 100% |
| Partisan Voting Index | Strongly Republican:+38 |
| Unemployment Rate (May 2026) | 5.9% |
| Area Code(s) | 406 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 99.25% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0.75% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |